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Case 1: To find the area bonded by two functions y =
Lf(y) &
f(x) and y=g(x) on the interval [a,b]
Case 2: To find the area bounded by two functions X=f(y) and X=g(y) on the interval [c,d]
A =
/bRing a AfdTopfly)-gyi
, Area between two curves
Steps
Find the intersection between the curves
Graph
Integrate
Ex1
Graph
3
y = 3 -
x
+y = -
x + 1 Step 2 : Step 3
S2) 1)dx
bottom
Step 1 A =
x +
3 -
x2 = -
X + 1
-
S2
= X2 x 2 - -
= 0
(x 2)(X + D
- = 0
=
-
x*+ x + 2dx
↓
L
.
X= 2 x= -
1
(a, 1) -
(1 2) , "Math 9"
4 .
3 u2
, Area between two curves
- Steps
Find the intersection between the curves
Graph
Integrate =* y
= 2 -x
x =y X= 2 -
y
Ex
y
=
x 22y = 2 -
X Step 2 : Graph x= Vy Step 3 In terms of or In terms ofy dy
dx
Tr (2 4) b
X x2
S (Top-bottom)dx S (Right-left) dy
.
= c -
x
X=
5y y=
A =
A =
x2+ x
:
-
2 =
S2-3)-Ey
(X
S
+ 2)(X -
D = 0
A=
·
↓ A=
(2x- ()
x= 2 X= 1
So g ( 5g)]dy
-
·
+ -
gzt "Math 9"
5u2
& = 4 .
2
4 5,.
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